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Shareholder Rights Plan - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 $ / shares shares
Class Of Warrant Or Right [Line Items] |
Number of shares of preferred stock authorized | shares | 4,991,000
Stockholder rights plan expiration date | 2019-01
Exercise price of preferred stock purchase right | $ / shares | $ 20.00
Percentage of Common Stock ownership to make rights exercisable | 15.00%
Series B Preferred Stock |
Class Of Warrant Or Right [Line Items] |
Preferred shares entitled to be purchased per right | 0.001

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- Definition Number of preferred shares entitled to be purchased per stock purchase right. + References No definition available. + Details
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- Definition Percentage of common stock person or group acquires to make rights exercisable. + References No definition available. + Details
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- Definition Shareholder rights plan expiration date. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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